harp vs restate

harp is a noun but restate is not a noun.

Word	Noun	Adjective	Verb	Adverb
harp	Yes	No	Yes	No
restate	No	No	Yes	No

As verbs, restate is a hypernym of harp; that is, restate is a word with a broader meaning than harp:

Other hypernyms of harp include ingeminate, iterate, reiterate, repeat, retell.

harp (noun)	restate (noun)
a chordophone that has a triangular frame consisting of a sounding board and a pillar and a curved neck; the strings stretched between the neck and the soundbox are plucked with the fingers
a pair of curved vertical supports for a lampshade
a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole

harp (verb)	restate (verb)
come back to	to say, state, or perform again
play the harp